How should the Collective respond to the potential admission of a felony on our website?

While the majority of Flutherites are wonderful, squeaky-clean individuals, it is not a stretch to accept that every so often, someone may admit on here, knowingly or not, to committing a serious crime, or even planning to commit one.

In this case, what should the proper community response be?
To someone admitting a crime?
To someone potentially threatening to commit one, whether explicitly or implicitly?
Do any such guidelines exist already?

Community dialogue time. 3, 2, 1, GO!